What is oven spring and what conditions promote it?

• A. Slow rise in oven due to continued yeast activity.
• B. Final rise during cooling after baking.
• C. Rapid dough expansion in the first minutes of baking due to gas expansion and steam; achieved with proper hydration, temperature, and steam.
• D. Expansion only from chemical leaveners after crust sets.

Answer: (C)

Oven spring is the rapid rise of dough that happens in the first minutes of baking as trapped gas expands and steam inflates the dough bubbles before the crust sets. When the dough hits a hot oven, the heat makes the gas inside—air and CO2 from fermentation—expand quickly. Steam in the oven also helps by keeping the surface moist, so the gas can push outward rather than break bubbles or form a crust too soon. If the dough has enough moisture and a strong gluten network, it can expand significantly before the crust hardens, creating that noticeable lift.

This isn’t due to continued yeast activity once in the oven, since heat kills the yeast almost immediately. It isn’t a final rise after baking, either, and it isn’t driven by chemical leaveners acting after the crust forms. The key factors are high initial temperature, good hydration to allow elasticity, and steam to prevent premature crust formation, all working together to maximize the early, rapid expansion.